1. Different properties: Q345B steel is a low-carbon alloy steel (c<0.2%). The carbon content of 20# steel is 0.2%, which is a low-carbon steel.
2. Different features
Q345B steel has good overall performance, good low temperature performance, good cold stamping performance, welding performance and machinability.
In addition to carbon (C) element, 20# steel also contains a certain amount of silicon (Si) (generally no more than 0.40%), manganese (Mn) (generally no more than 0.80%, higher up to 1.20%) and other alloying elements .
3. Different applications
Q345B steel is widely used in bridges, vehicles, ships, buildings, pressure vessels, etc. Q stands for yield, and 345 means that the yield value is around 345MPa, and the yield value decreases as the thickness of the material increases.
20# steel is used in the manufacture of small and medium-sized carburizing and carbonitriding parts that are not important in automobile, tractor and general machinery manufacturing, such as handbrake shoes, lever shafts, transmission speed forks, transmission passive gears and camshafts on tractors, suspension equalizer shafts, equalizer inner and outer bushings, etc.
Just like you, 70% customers choose long-term cooperation with BBN steel not only for our good product and service quality, good reputation in the international market, but also for our experienced one-stop raw material supply and further steel processing!
